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Impact of artificial aeration on phytoplankton growth and seasonal succession in a Eutrophic Lake.

机译：富营养化湖泊中人工曝气对浮游植物生长和季节演替的影响。

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摘要

Excessive phytoplankton growth caused by increased loadings of nitrogen (N) and phosphorus (P) is the most visible symptoms of eutrophication. At higher densities phytoplankton creates water quality problems such as offensive taste and odor, impaired aesthetics, depletion of dissolved oxygen (DO), and cyanotoxicity concerns.;Artificial aeration is commonly used to eliminate thermal-stratification, to increase DO levels in lakes and reservoirs, and to control P-release from sediments. This research was conducted to evaluate the impact of aeration on sediment nutrient release, nutrient availability for phytoplankton growth, phytoplankton seasonal succession and Cyanobacterial growth. Water samples for nutrient and phytoplankton analysis were taken from a eutrophic reservoir in North Dakota under aerated and non-aerated conditions, where sediment nutrient release was identified as a major source of N and P. Aeration eliminated thermal stratification and increased DO concentrations throughout water column. When aerated, aerobic condition at the sediment-water interface reduced sediment P-release by nearly 50%. However, phosphorus release due to degradation of organic matter continued and was likely enhanced by increased DO levels. Induced mixing from aeration made nutrients equally distributed in the water column and more available for phytoplankton growth, which led to more phytoplankton growth measured as higher chlorophyll-a concentration and phytoplankton biovolume. Results of this study reveal that increased mixing and nutrient availability due to aeration are the major reasons for changes in phytoplankton seasonal succession resulting in favoring growth and shifting growth-periods of diatoms, dinoflagellates, and Cyanobacteria. Seasonal succession of phytoplankton community was also affected by nitrogen limitation in the reservoir. Ability of Cyanobacteria to grow at low N concentrations and low N:P ratios stimulated nitrogen-fixing cyanobacterial species to bloom and maintained higher cyanobacterial growth. Aeration did not reduce algal and cyanobacterial growth in the reservoir.
机译：氮（N）和磷（P）含量增加引起的浮游植物过度生长是富营养化最明显的症状。在较高的密度下，浮游植物会产生水质问题，例如令人厌恶的味道和气味，美观受损，溶解氧（DO）耗竭和氰基毒性问题。；人工曝气通常用于消除热分层现象，从而增加湖泊和水库中的DO含量，并控制沉积物中的磷释放。进行这项研究以评估曝气对沉积物养分释放，浮游植物生长，浮游植物季节演替和蓝藻生长的养分有效性的影响。用于营养和浮游植物分析的水样取自北达科他州富营养化水库，在有气和无气条件下，沉积物养分的释放被确定为氮和磷的主要来源。曝气消除了热分层并增加了整个水柱中溶解氧的浓度。充气后，沉积物-水界面的有氧条件使沉积物P的释放减少了近50％。然而，由于有机物降解而导致的磷释放仍在继续，并且可能由于溶解氧水平的提高而增加。曝气引起的混合使营养素均匀地分布在水柱中，并且可用于浮游植物的生长，因此，以较高的叶绿素-a浓度和浮游植物的生物量来衡量，导致浮游植物的生长更多。这项研究的结果表明，由于曝气引起的混合和养分利用率的提高是浮游植物季节性演替变化的主要原因，这导致硅藻，鞭毛藻和蓝藻的生长和生长周期发生变化。储层中的氮限制也影响了浮游植物群落的季节性演替。蓝藻在低氮浓度和低N：P比值下生长的能力刺激了固氮蓝藻菌种开花并维持了较高的蓝藻菌生长。曝气并未减少水库中藻类和蓝细菌的生长。

著录项

  • 作者

    Valkov, Veselina Aleksandrova.;

  • 作者单位

    North Dakota State University.;

  • 授予单位 North Dakota State University.;
  • 学科 Environmental science.;Limnology.;Water resources management.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 431 p.
  • 总页数 431
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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